Fuse-plug.



H. VON PHUL THOMAS.

FUSE PLUG. Arrucm'on FILED IAYH. ms.

1,225;8=90. Patented May15,1917.

- 2 SHEETS-SHEET I.

H. VON PHUL THOMAS.

Fuss PLUG.

APPLICATION Fl [D I Y |5| I916- 1,225,890. Patented May 15, 1917.

2 SHEETS-SHEET 2. f

element.

UNITED STATES PATENT OFFICE.

HENRY VON PHUL THOMAS, OF KIRKWOOD, MISSOURL-ASSIGNOR 1'0 KILLARK ELECTRIC MANUFC'IURING COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MIS- soum.

FUSE-PLUG.

1,225,890, Specificationoflettcrslatest- PatentedMa-y 15,1917.

; f Application amenit 15,1916. SerlalNo.87,582.

To allwhom it 1u a concern.

Be it known hat- I, IIENRY vex Pn'un 'lnouns, a citizen f'of the United States, residing at Kirkwood county of St. Louis, State of Missouri, have invented a certain new and useful Improvement in Fuse-Plugs, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof. x

This invention relates generally to thermal cut-outs and, more especially, to acertain new and usefulimprovem'ent in that type of cut-outs commonly known as fuseplugs.

As heretofore generally constructed, so far as I am aware, cut-outs of the type stated comprise a chambered or cup-shaped so-called body-memberu-ofi insulatin materiaha screw-threaded contact-men] r or shel for engagement with the usual socket, thisshell surrounding or inclosing the lower portion of the body-member, a cover consistm of an insulation-disk and a flan ed meta lie ring or apertured cap for hol ing the disk fiatwise against the outer or upper end of thelbod -member, and the usual fusible he cover comprisin the insuiation-disk mentioned is employs mainly for the purpose of preventin particles of the fusible element, on. a b owing or fusing t hereof,--escaping from the otherwise open end of the so-ealled bady member and thereby possibly causing fires or other accidents; and in order that the condition of:

the fusible element of the plug may be at alltimes visually observed, this disk is usually of mice orother trans arent insulation material.- For purposes 0 description, this insulation disk may hence be well called the window of the fuse'or' lug. In fuses of.

this type, it isv essential t at the shell andcover or window be .each securely fixed or fastened upon the body-member, so that the cover may resist and not-be blown off under explosive stresses on a.ru ture of the fusible element, and that the she I may resist shearing or other'stresses to which it may be subjected on the plug bein seated in or removed from its socket. ence, in the pro-. duction or manufacture of plugs or fuses of this class comprisin ,as heretofore, the several parts stated, t e cover and shell are necessarily {each separately and independently ene'froni the other fastened to and ,ployment of my upon the so-called body-member; consequeutly, because of the said separate parts and t 1e -several operations gone through with in operatively assembling the same, tli cost of production or manufacture of such plugs is correspondingly relatively high.

The principal object of the present invention is to obviate many of the parts and assembling operations now required in the production and manufacture of fuses o this type and to simplify and generally improve upon, and chea )en the cost of production or manufacture of, fuses of the class described.

To the end stated and with the above and other objects in view, my invention resides in the provision of a fuse-plug comprising a member adapted to provide not only a socalled shell for enga ement with the usual socket, but also a rigi retainer for the mica disk or other window of the plug, this com bination-member being conveniently and with ease and at slight expense so operatively fitted or mounted upon and engaged or interlocked with the insulation member of the plug to adequately resist and overcome any explosive, shearing, or other strains or stresses to which the plug may in use be subjected and which may tend to mechanically' rupture'the plu By the emnew combined socket-err ging and. window-retaining member, I ience provide at comparatively low cost and expense a most eilicient fuse of the type described.

M new combined socket-engaging and win ow-retaming member, I have found from experience, may have different forms and structural shapes and may be variously incorporated or embodied in the finished plug. ,As illustrating my invention, I have accordingly shown in the accompanying drawings several different types of my new combined socket-en aging and window-retaming member an of fuse plugs embodying the same but it is to be understood that my combine socket-engaging and window retaining member, as well as fuse plugs embod i'ng the same, may have other forms witli out departing from the nature and spirit of my invention;

In the accompanying drawings, wherein. as stated, I have illustrated several nhodi ments of my invention,

Figures 1 and 2,1ire, res ectively, Ian and side .elevational views 0 a fuse p ugembodying what may be described as the preferred form of my invention 1 Fig. 3 is a vertical sectional view of the same taken approiimately on the line 3-3,

bodyinga slightly'modified form of my -inventlon;

Fig. 8 1s a vertical sectional new of the same taken approximately on the line 8-8,

Fig. 6;

Fig. 9 is an inverted plan view thereof; Figs. 10 and 11 are, res ectively, plan and side elevational views 0 a fuse lug em-' bodying a second slightlymodifie form of my invention;

' Fig. 12 is a vertical sectional .view of the same taken approximately on the line 12- 12, Fig. 10;

Fig. 13 is an inverted plan view thereof Figs. 14 and 15 are pers ective views o the parts which when fixe together upon the insulation member of-the plug comprise the combination soclret-engagin and window-retaining member of this ormcf my invention;

Figs. 16 and 17 are, respectively, plan.

and side elevational views of a fuse embodying a third slightly modified of my invention;

Fig. 18 is a vertical sectional view of'the same taken approximately on the line 18- 18 Fig. 16;

Fig. 19 is a side .elevational view of the combination socket-engaging and windowretaining member of this form of my inven tion;

sulation member of this form tion;

Figs. 21 and 22 are, res ectively, plan and side elevational views 0 a fuse-plug embodying a fourth slightly modified form of my invention;

Fig. 23 is a vertical sectional view of the same taken approximately on the line 28- 23. Fig. 21;

Fig. 24 is an elevational view of the combination socket-en a 'ng and window-retaining member 0 t is cm of my invention' Fig. 25 is a perspective view of the insulation member of this form of my invention;

Figs. 26 and 27 are, respectively, plan and side elevational views of a fus'e Plug embodying a fifth slightly modified cm of my invention;

of my invenmem Fig. 20 is a perspective'view of the in-' Fig. 28-is a vertical sectional view of thesame taken approximately on. the line 28-28,v Fig. 26;

Fig. 29- 1s a side elevational view of the insulation member of this form of my invention; and

Fig. 30 is a fragmentary perspective view of the combined socket-engagin and window-retaining member of this orm of my invention. I

Referring now particularly to the form of my invention illustrated in Figs. 1 to 5 0th inclusive 1 indicates that part of the ping which i will call the insulationr. This member 1 may be of any suitable shape and may be described -as being an electricallydnsulating body which supports the center bottom contact-button, member 1 also forming the lining and nucleus for the socket-engaging member and providing the seat for the inelosing window. As here shown, member 1 is substantially a cup-shaped-or cylindrical chambered section or piece of porcelain, fiber, or the like molded or otherwise formed into the desired shape. At its lower or integrally closed end, member 1 is )rovided with the usual center-contact 2, e ectrieally contacting or engaging with which withinmember 1 is one end of the usual fusible element 3. its u per end, member 1 is preferably inin annulus or collar 4 adapted to serve as a and or finger-grip for the plug, whereby the plug may with safety be seated inor removed from its cooperating socket, not shown. At its upper end also, member 1 is cut away or counterbored to provide a seat upon which, within. collar 4, flatwise fits a window-diskli of mica or other suitable -.transparent' insulation material. At the base ,of its said cut-away orcounterbored portion, member 1 is cut away longitudi- -nall to provide preferablya pair of diametrica ly opposite arcuate slots 6, the inner walls of which slots are approximately flush or in alinement with the outer's'ur ace of the lower or reduced portion of member 1.

A indicates the combination socket-engaging and window-retaining member of the plug. This member A, which is of suitable metallicmaterial, preferably integrally comprises a ring 7 adapted to fit upon the upper end of member 1 within collar 4 and over insulation-disk or window 5, and diumetrically opposite legs 8, approximately arc-shaped in cross section,- adapted to pro- .jectthrou h the slots 6 and along the outer surface 0 'the lower or rediiced portion of member 1, as shown. Through the. greater portion oftheir lengtln'legs 8 are spirally crimped or otherwisesuitably formed to provide Bcrew-thremls 9 f or engagement with the usual threaded-socket. Member A bein; so li'ran'ged upon insulation-member 1,

tegra 1y enlarged to provide an overhang-.

or window 5. At its upper end also, insula- 'tion-member 1' is cut awayilns at 25, to pro:

vide a air of diametrica y o posite areshaped attlements or the like 2 adapted to 5 serve as a hand or finger grip for the plu whereby the plug may be convenient seated in or removed from its socket. indicates the combination socket-enga ing and window-retainin member of the p ug. This member-E, which is likewise of suitable metallic material,'comprises a spirall crimped or otherwise threaded c lindrica or tubular open-ended shell 27 a apted to tightly fit upon and around insulation-memher 1' as shown. At 8411378? end, shell 27 is provided with a pair of iametrically opposite projections or lips 2828',"one of p which, as, for instance lip 28, is provided with an apertured circular extension or ring 29. Shell 27 being endwise slipped upon insulation-member 1', its lips or projections 28-28 are fitted in the spaces *between lmttlements 26 and bentinwardly over and upon the upper end of insulation-member 25 1, ring 29 then extending fiatwise over and upon disk or window 5 and bein preferably soldered or otherwise electrics. ly fixed to v opposite lip 28'. The lower end of-shell 27 is also spun or flanged, as at 80, under the 30 lower end of insulation-member 1, the'parts being thereby securely fixed together and the shell 27 likewise providing both a socketengaging and window-retaining member for the plug; This form of plugmay also be readily manufactured at comparatively'low .cost, the fusible element'3 -at its upper end being suitably projected through insulationinember 1"-to electrically engage with the metallic shell 27. 40 In the fifth modified form of my invention illustrated in Figs.- 26 -to 30, both inclusive, l'is the insulation-member, which again is preferably a cup-shaped or cylindrica] chamberedsection. or'piece of porcelain, fib'er, or the like,-,2 is the center-eontact, and 3 the fusible clement. Fitting flatwise upon the upper end-of insulation-member 1 is the usual insulalion-diskor window 5, and also fitting uponthe upper end of inso sulation-meinber 1' and upon disk or window 5, is-a flanged centrally apcrtured cap'3l.

Upo'nzits outer surface and throughout preferablythc greater part of its length, insulation membei' l' is spirally'grooved, as at 32. At its'upper end, insulat1on-member 1' is further" provided upon its surfacefwith a pair of up roximately diametrically opposite vertica ly-disposed grooves 83 oontngu- (as with, or leadin into, spiral groove 2, ed tiese-grooves 32-3 being adapted toproe vide a seat forthecombination socket-"en'- gagin and window-retainin 1 I the plu which is here pre erably n the form of a one-piece wire F approximately semhcylindrieal in cross-section. This-wire member- 'of F is suitably fixed at its lower end to insulation-member 1 adjacent the base thereof, 18 then seated in ve 32 and spirally wound around ins ation-member 1', then carried through one roove. 33 up, over, and across the upper en of insulation-member 1' up cap 81, and then bent downwardly u n t e opposite side of insulation-member 1 .into'opposite slot 38, its free end being soldered or otherwise electrically connected with the upper coil or strand of the wire.

..The irally wound and fixed wire F thus provi es both a soeket-engaging-and window-retainin member for the plug, this plu embodying. my invention being also eas y manufactured or produced and at sli ht cost.

us, throughout the several described-- embodiments of my, invention, it will be seen that I provide anefiicient 'fuse plug of few partsand the'parts of which may with ease and convenience and practically v at'one operation be operatively assembled. thereby simplifying the construction of plugs of this type and cheapening the cost of reduction.

aving thus described my invention, what I claim and desire to secure by Letters Patout is:'-

1. A fuse lug or the like including a combined soc et-engagingand window-re- 'taining member.-

2.- A fuse plug or the like including an insulation-member, an insulation -window, .and a metallic-member fixed upon the insulationmember and includinga window-retaining portion, the metallic-member adapting1 the plu for engagement with a socket n its sai window-retaining portion engaging upon said window to retain the same in operative position upon the insulation-member. a

3. -A fuse plugor the like including a chambered insulation-member, an insulation-window fittin flatwise upon the insulation-member MK providing a closure for its said chamber,- and a metallic-member fixed upon the insulation-member, said metallic-member having a portion adapting the plug for engagement with a socket and a portion engaging upon the window to retain the same in operative position upon the insulation-member.

I 4. A fuse plug or the like including a cylindrical chambered insulation-member, an insulation-disk fitting fiatwise upon the insulation-member and providing a closure for its saidchamber, and a metallic member fix'ed upon the'insulatidn-member, said metallic-member having a" artly threaded portion ada ting the plu or engagement with a threa ed socket an "a. portion-engaging updnnaiddisk to retain the same inopera the position upon the insulation-member.-

"mil. o

'5.-'A fuse-plug er the like ingl pding a eylee .prlsin iusulutiondisk fitting flatwise-upon the in-' sulation-member and providinga closure forus said chamber, and a partly-threaded metallic-member fitting upon the insulation-' member and locked at oneend thereunder,

the metallic-member adapting the plug for engagement with a threaded socket and re taiuing said'disk in operative position upon the insulation-member.. i

T. A fuse-plug orthe like including n cylindrical chambered insulation-member, an insulation-disk fitting flatwise upon the insulation-member and providing-a closure for its said chamber, and a partly threaded metallie member fitting upon the insulationmemher and locked at one end thereunder; the metal]ic-member ada ting the plug for engagement with athreac ed socketand comprismg a ringfitting' upon the disk to retain ihe same in operative-position upon the'insulatum-member. a 5', g

S. A fuse plug or the like including n cylindrical, chambered insulation-inember, an

its said chamben and-a metallic-member fitting upon the insulation-member and com p t y an ;apertured' portion: and threat ed "leg-portions, "said aperture portion engaging upon said diskfto. retain the same in operative. 1iosition'uponthe ins'ulay tion manner; and said-leg ortion's being locked at oue'eindw the'insn ation-member I a threaded socket. V 9. A fuse plug or the like coniprising'a cy and adapting fthe'plug for engagement with lindrical chambered insulation-memberpro vided with an overhanging c'ollar, an insumenace] '1 threaded P 'lation-disk seated upon the insulation-menipartly' threaded legs, said ring engaging upon then er-end' of the insulationanenr ber oier' sa1 disk and said legs projecting through said slots and lengthwise along the insulation-member, said legs being locked at one end under the insulation-member and adaptin the plug for engagement with :1

threaded socket.

- 10. In a fuse plug or, the like, a chambered insulation-member and -.a window on the in sulation-member for its said chamber, in combination with a metallic-member that is engngeable' with the insulation=membelr of the pill said member including a portion adapte to lock the window of'the plug u on the insulation-member and a portion a apted for threaded engagement with a socket.

11. In a fuse plugor the like, a. chambered insulation-member and awindow on the i in sulation-member for its 'saidchamber, in combination with a metallic membe that is adapted to engage with and ,upon the'j o'ppd site ends of the insulation-memben-bf the plug to lock the-window of the plug upon. 'th'e insulation-member and adapt the insu lation-member for threaded engagement withu'socket. iiisnlation-dislt'fitting l latu'ise upon .the illsnIation-mcmber and providing a-closure for'- '12. Ainetallicqnember for.fnse plugs and "theilike that is adapted to engage with'and upo op osite ends of the insnlation-mem bereft e 'plu saidmember includin a upon;.the.o posite endsof the insulationmember of't e, In ,salidinember including a ring and part y t readed legs.

- -In .testimony'whereof, I have signed my name, to this specification.

- m PHUL THOMAS.

Copies of this potent may beottalned ter in; oenta e eeh addressing the Commtuloner ot rerun.

"1i wummnur- 

